ClimbCheck · Instagram @climbcheck.io
Density Altitude & Takeoff Performance Calculator
ClimbCheck is a free METAR-based density altitude, pressure altitude, takeoff performance, and runway margin calculator for general aviation pilots.
Fetch or paste a METAR, edit weather values manually, enter runway length and baseline takeoff distance, compare performance models, and visualize runway usage.
ClimbCheck is designed for quick preflight awareness and flight training scenarios. Pilots can compare how temperature, pressure, field elevation, runway length, and baseline takeoff distance affect estimated performance, then verify final numbers against the aircraft AFM/POH and official weather sources.
What ClimbCheck calculates
METAR, pressure altitude, and density altitude
ClimbCheck can use a fetched or pasted METAR to decode temperature, dew point, altimeter/QNH, wind, visibility, clouds, and flight category before estimating pressure altitude and density altitude.
Takeoff distance and runway margin
- Pressure altitude from field elevation and altimeter setting or QNH.
- Density altitude from pressure altitude, temperature, and dew point/humidity effect.
- Takeoff distance increase using Precise, Legacy Koch, and Rule-of-thumb models.
- Runway margin, runway usage, and runway equivalency.
Pilot performance guides
Quick FAQ
Does ClimbCheck replace the aircraft POH/AFM? No. ClimbCheck is an educational planning aid. Always verify final performance with official sources and aircraft documentation.
Why enter baseline takeoff distance? The baseline should come from your aircraft-specific performance reference. ClimbCheck estimates how current conditions change that baseline.
Educational planning aid only. Always verify aircraft performance with official weather, runway data, AFM/POH performance charts, and pilot judgment.